Add progressive web app companion for cross-platform access

Vite + TypeScript PWA that mirrors the Android app's core features:
- Pre-processed shelter data (build-time UTM33N→WGS84 conversion)
- Leaflet map with shelter markers, user location, and offline tiles
- Canvas compass arrow (ported from DirectionArrowView.kt)
- IndexedDB shelter cache with 7-day staleness check
- Service worker with CacheFirst tiles and precached app shell
- i18n for en, nb, nn (ported from Android strings.xml)
- iOS/Android compass handling with low-pass filter
- Respects user map interaction (no auto-snap on pan/zoom)
- Build revision cache-breaker for reliable SW updates

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pwa/node_modules/@vitest/mocker/dist/index.d.ts

@@ -0,0 +1,19 @@
+import { M as MockedModuleType } from './types-DZOqTgiN.js';
+export { A as AutomockedModule, d as AutomockedModuleSerialized, a as AutospiedModule, e as AutospiedModuleSerialized, b as ManualMockedModule, f as ManualMockedModuleSerialized, g as MockedModule, h as MockedModuleSerialized, c as MockerRegistry, j as ModuleMockFactory, k as ModuleMockFactoryWithHelper, l as ModuleMockOptions, R as RedirectedModule, i as RedirectedModuleSerialized } from './types-DZOqTgiN.js';
+
+type Key = string | symbol;
+interface MockObjectOptions {
+    type: MockedModuleType;
+    globalConstructors: GlobalConstructors;
+    spyOn: (obj: any, prop: Key) => any;
+}
+declare function mockObject(options: MockObjectOptions, object: Record<Key, any>, mockExports?: Record<Key, any>): Record<Key, any>;
+interface GlobalConstructors {
+    Object: ObjectConstructor;
+    Function: FunctionConstructor;
+    RegExp: RegExpConstructor;
+    Array: ArrayConstructor;
+    Map: MapConstructor;
+}
+
+export { type GlobalConstructors, type MockObjectOptions, MockedModuleType, mockObject };